µTunes library

To download a Spotify album: https://spotdl.com/

To download from YouTube:

$ youtube-dl -x --audio-format mp3 <url>
$ youtube-dl -o "%(playlist_index)d %(title)s.%(ext)s" -x --audio-format mp3 <url>

To transcode files to MP3:

$ ffmpeg -i in.m4a out.mp3
$ for file in *.m4a; do ffmpeg -i $file ${file/m4a/mp3}; done

To split a concatenated audio file into individual tracks:

$ mp3splt -p nt=<num tracks> -s in.mp3

If the automatic silence detection isn't good enough, splitpoints can be provided and then automatically adjusted (timestamp H:MM:SS should be expressed as MM.SS):

$ mp3splt -a -p gap=3 in.mp3 0.00 ... EOF

To crop an image:

$ display <image>

Tags:

• Basic track information
  • song: name of the track
    • song_sort: alternate track name that's more friendly for sorting (usually same as song)
  • album: name of the album
    • album_sort: alternate album name that's more friendly for sorting (usually same as album)
  • album_artist: the person or group responsible for the album, optimized for grouping albums
    • album_artist_sort: alternate album artist name that's more friendly for sorting (usually same as album_artist)
  • artist: the artist for the specific track, usually same as album artist
    • artist_sort: alternate track artist name that's more friendly for sorting (usually same as artist)
  • composer: the composer of the specific track, or omitted
    • composer_sort: alternate composer name that's more friendly for sorting (usually same as composer)
  • track: sequential number of the track (should be positive integer or omitted)
  • disc: sequential number of the disk (should be positive integer, use 1 if no discs)
  • year: four-digit year of publication of the music
• µTunes data
  • id: eight-digit hex string used as unique identifier for song, assigned by µTunes automatically and used as primary key
  • filename: path on disk (used for import, then managed automatically)
  • artwork: path of the album artwork (not actually used by µTunes, but I think of it that way; relative to artwork directory)
  • last_play: timestamp of last time song was played, in ISO8601 format (e.g. 2019-05-15T19:40:29)
  • play_count: number of times the song has been played, non-negative integer
• Source information
  • acquired_legally: yes or no, was part of the album purchased or downloaded for free from an official distributor
  • acquired_illegally: yes or no, was part of the album obtained without the permission of an official distributor (if the album is pirated from a different source after being purchased, this doesn't count)
  • as_bundle: yes or no, was obtained as part of a larger non-music purchase
  • as_gift: yes or no, was given as a gift (should still include pricing information; gift cards count)
  • group: used to separate a single album into multiple groups whose source information should be considered as separate, or to join parts of different albums together (either omitted to assume default album grouping, or a random unique eight-digit hex string)
  • paid: amount of money that was paid for the song in USD, in XX.YY format (0.00 if pirated)
    • min_price: minimum purchase requirement (for Bandcamp etc.), if different from price
  • date: when the album was added to my library (or downloaded, if there was a delay), in YYYY-MM-DD format
  • source: URL of website that the download or purchase came from
  • tracklist: URL of website with canonical tracklist, if I had to rename all the tracks
  • refined_source: if I purchased the album and then needed to pirate a better-tagged version of it from somewhere else, a URL for the secondary source

Currently nullable fields:

• composer
• composer_sort
• group
• import_uuid
• last_play
• min_price
• paid
• play_count
• refined_source
• track
• tracklist